Emotional facial expressions capture attention

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Emotional and motivational factors are known to influence attention.
• This influence has not been previously studied in patients with unilateral inattention, specifically left spatial neglect.
• Understanding this interaction is crucial for patients with brain damage affecting spatial awareness.

Purpose of the Study:

• To investigate if the emotional significance of visual stimuli affects spatial attention.
• To examine this effect in patients diagnosed with chronic left spatial neglect and visual extinction.

Main Methods:

• Three patients with right parietal stroke-induced chronic left neglect and visual extinction were studied.
• Stimuli included shapes and faces (neutral, happy, angry expressions) presented in the right, left, or both visual fields.
• Patient responses were recorded for stimulus detection and extinction on unilateral and bilateral trials.

Main Results:

• On unilateral trials, patients detected all stimuli equally across visual fields.
• During bilateral trials, patients extinguished faces less often than shapes in the neglected (contralesional) field.
• Emotionally expressive faces (happy, angry) were extinguished less frequently than neutral faces.

Conclusions:

• Facial features and emotional expressions are processed even when in the unattended visual field.
• Emotional salience of stimuli can influence the spatial distribution of attention, potentially overriding neglect.
• Findings suggest attention control involves frontoparietal, limbic (cingulate cortex, amygdala), and ventral temporal lobe networks for affective processing and prioritization.